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Multifunctional polycarboxylate water-reducer containing gradient polymer side chain and preparation method of multifunctional polycarboxylate water-reducer

A gradient polymer and gradient copolymer technology, applied in the field of polycarboxylate superplasticizer, can solve the problems of poor adaptability and soil sensitivity of cement and fly ash, achieve good suspension, delay cement hydration speed, reduce shrinkage and cracking effect

Active Publication Date: 2020-01-07
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical engineering applications, it is also found that polycarboxylate superplasticizers have many shortcomings, such as sensitivity to soil, poor adaptability to cement and fly ash, etc.

Method used

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  • Multifunctional polycarboxylate water-reducer containing gradient polymer side chain and preparation method of multifunctional polycarboxylate water-reducer
  • Multifunctional polycarboxylate water-reducer containing gradient polymer side chain and preparation method of multifunctional polycarboxylate water-reducer
  • Multifunctional polycarboxylate water-reducer containing gradient polymer side chain and preparation method of multifunctional polycarboxylate water-reducer

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Embodiment 1

[0033] An embodiment of the polycarboxylate water reducer containing gradient polymer side chains in the present invention, the polycarboxylate water reducer containing gradient polymer side chains in this embodiment is prepared by the following method:

[0034] (1) Add monomer vinylpyrrolidone, water, and sodium acrylate into a four-necked round-bottomed flask. Under nitrogen protection, add CuCl and 2,2'-bipyridine (BPY), heat up to 40°C, and stir for 40 minutes. The reactant is fully dissolved, and the initiator 3-bromopropene is added to initiate the polymerization. After 5 hours, the nitrogen gas is stopped to terminate the reaction, and an aqueous solution of polyvinylpyrrolidone and polyacrylic acid gradient copolymer active macromonomer is obtained; wherein, the reactant The molar ratio is: vinylpyrrolidone: sodium acrylate: 3-bromopropene: CuCl: BPY=50:50:1.0:0.15:0.15;

[0035] (2) In the four-necked flask in step (1), add PEG active macromonomer, heat up to 35°C, st...

Embodiment 2

[0038] An embodiment of the polycarboxylate water reducer containing gradient polymer side chains in the present invention, the polycarboxylate water reducer with gradient polymer side chains in this embodiment is prepared by the following method:

[0039] (1) Add monomer vinylpyrrolidone, water, and sodium acrylate into a four-necked round-bottomed flask. Under nitrogen protection, add CuBr and 2,2'-bipyridine (BPY), heat up to 85°C, and stir for 20 minutes. The reactant is fully dissolved, and the initiator 3-chloropropene is added to initiate polymerization. After 10 hours, the nitrogen gas is stopped to terminate the reaction, and an aqueous solution of polyvinylpyrrolidone and polyacrylic acid gradient copolymer active macromonomer is obtained; wherein, the reactant The molar ratio is: vinylpyrrolidone: sodium acrylate: 3-bromopropene: CuBr: BPY=80:50:1.6:0.3:0.3;

[0040] (2) In the four-necked flask in step (1), add PEG active macromonomer, heat up to 60°C, stir to fully ...

Embodiment 3

[0043] An embodiment of the multifunctional polycarboxylate water reducer containing gradient polymer side chains of the present invention, the multifunctional polycarboxylate water reducer containing gradient polymer side chains described in this example is prepared by the following method Income:

[0044] (1) Add monomer vinylpyrrolidone, water, and sodium acrylate into a four-necked round-bottomed flask. Under nitrogen protection, add CuCl and 2,2'-bipyridine (BPY), heat up to 65°C, and stir for 30 minutes. The reactant is fully dissolved, and the initiator 4-bromo-n-butene is added to initiate the polymerization. After 7 hours, the nitrogen gas is stopped to terminate the reaction, and an aqueous solution of polyvinylpyrrolidone and polyacrylic acid gradient copolymer active macromonomer is obtained; wherein, The molar ratio of the reactants is: vinylpyrrolidone: sodium acrylate: 3-bromopropene: CuCl: BPY=65:70:1.4:0.2:0.25;

[0045] (2) In the four-necked flask in step (...

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Abstract

The invention discloses a multifunctional polycarboxylate water-reducer containing a gradient polymer side chain and a preparation method of the multifunctional polycarboxylate water-reducer. An ATRPmixing one-step method is utilized to synthesize a polyvinylpyrrolidone (PVP) and poly(methyl) acrylic acid gradient copolymer active macromonomer; aqueous solution free radical copolymerization is carried out on the macromonomer, (methyl)acrylic acid and a PEG active macromonomer; the polycarboxylate water-reducer with PEG and the PVP and poly(methyl) acrylic acid gradient copolymer as side chains is synthesized; a special comb-shaped structure of the water-reducer endows the water-reducer with good adsorption, dispersion, water reduction, slump loss resistance, suspension and emulsificationproperties, and the water-reducer is a multifunctional polycarboxylate water-reducer with excellent performance.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a multifunctional polycarboxylate water reducer containing gradient polymer side chains and a preparation method thereof. Background technique [0002] Polycarboxylate high-performance water reducer has the advantages of low dosage, high water reducing rate, and good slump retention. The molecular structure can be designed, and its function can be easily adjusted to meet and promote market demand. Since then, it has been a research hotspot of concrete admixtures. However, in practical engineering applications, it is also found that polycarboxylate superplasticizers have many disadvantages, such as sensitivity to soil, poor adaptability to cement and fly ash, etc. In order to solve the shortcomings of polycarboxylate superplasticizers and give full play to their advantages, a variety of functional polycarboxylate superplasticizers are usually used in combination in an appropriat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/02C04B24/26C04B103/30
CPCC08F299/026C04B24/2694C04B2103/302
Inventor 张小富白淑英赵利华
Owner GUANGDONG REDWALL NEW MATERIALS
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